Adjustable mechanical connection



July 6,1926. 1,591,575 r D. B. SWAIN I ADJUSTABLE MECHANICAL CONNECTION Filed April 8, 1925 ,I ma

' INVENTOR Tzyfi 11 0Mu a. BY

A'ITORNEY5 Patented July 6, 1926.

UNITED STATES PATENT OFFICE.

DONALD B. SWAIN, OF IVIONTAGUE, MASSACHUSETTS, ASSIGNOR T0 MILLERS FALLS COMPANY, OF MILLEES FALLS, MASSACHUSETTS, A CORPORATION OF MASSA- CHUSETTS.

ADJUSTABLE MECHANICAL CONNECTION.

This invention relates to a mechanical adjustment of improved construction which will be useful in numerous associations, and is particularly adapted to be employed in connection with mitreboxes.

It is a general object of the invention to provide a device which will efiiciently perform the purposes for which it is intended, and which will also be economically and readily manufactured and easily assembled.

A further object resides in the provision of a mechanism of improved construction for adjustably connecting a plurality of members together in such a manner that adjustment may readily be made, and subsequently, the members may with facility be locked against further movement.

A still further object is that of constructing a mechanism of the character outlined, in which, in addition to a main adjustment, asecondary adjustment may also readily be made. I

Other objects of the invention will in part be obvious and will in part appear hereinafter.

With these and further objects in mind, the invention accordingly comprises the features of construction, combination of elements, and arrangement of parts which will be exemplified in the construction hereinafter set forth and the scope of the application of which will be indicated in the claims.

Fora fullerunderstanding of the nature and objects of the invention reference should be had to the following detailed description taken in connection with the accompanying drawing, in which Fig. 1 is a plan view of a mitrebox embodying one form of adjustment constructed within the terms of the present invention;

Fig. 2 is a side elevation of this appliance;

Fig. 3 is an enlarged fragmentary side elevation of the adjustment; and

Fig. i is a face 'view thereof.

Primarily with reference to Figs. 1 and 2, in which the invention has been depicted in connection with a mitrebox, it will be ob served that the latter includes a deck or work-supporting surface 5 and a rear rest 6. Extending above the deck 5 is a sawguide, including a pair of spaced plates 7 connected together by a U-shaped arm or bar, generally indicated at 8.

This guide is retained in position above the deck in any desirable manner, as, for example, by the use of an arm 9, with which it is connected in a manner hereinafter brought out,-this arm extending, in the present instance, to a point below the deck 5 and being connected with an adjusting member 10. Thus, as will be readily understandable, upon the adjusting member 10 bemg moved the arm or bar 9 will be correspondingly moved, consequently swinging the saw-guide to extend to any desired angle with respect to the work supported upon the deck 5.

'Now, with reference to the connecting mechanism, which in the present exemplification is utilized to adjustably associate the arm or bar 8 with the member 9, it will be. observed--as in Figs. 3 and 4lthat a U- shaped bracket 11 is employed, the arms of which are formed with openings slidably accommodating the bar 8. The shank of a screw 12 extends through an opening located approximately in the center of this bracket, and it will here be observed that this opening is preferably of a size materially greater than the screw shank. The upper end of the latter may provide a winged head 13 so that the shank may be manually turned, and a spring 14 may be conveniently coiled around the body of the shank and interposed between this head and the outer face of the bracket 11 in order to normally urge the screw away from the bracket.

The end of the bar or arm 9 is extended within the bracket 11, and at this point is preferably shaped to provide a beveled lower edge 15 and a plurality of outwardly-extending lips 16 adjacent its upper edge, which lips will bear against the inner face of the bracket at a point adjacent thejuncture of one arm with the base thereof. This bar is also formed with a screw-threaded bore in line with the opening through the base of the bracket, and thus, the stem of.

the screw may extend into this bore and beyond the inner face of the bar and bear against the outer face of the bar 8, as has been most clearly shown in Fig. 3.

It will be observed that a set-screw 17 extends through a screw-threaded opening formed in the bracket 11, and in that face of the same which extends substantially parallel to the beveled lower edge-portion of the bar 9. Thus, the end of this screw may be adjusted to bear against this beveled face, and it will be observed that contact between the bar and the screw will, be assured incident to the provision or" the spring 1-1, which will tendas aiorestatedto retract the bolt 12, and, incident to the fact that the latter is coupled with the bar, will tend to swing the latter on the lips 16,these elements acting as fulcrums and the swinging movement being limited by the screw 17. A similar fulcrum action will result when this screw is projected or retracted, and in such projection and retraction it will be obvious that it the bar 9 is stationary and the bar 8 is free the. latter will be swung around the axis of the former. Conversely, if the bar 8 is maintained stationary and the bar 9 is free, the latter will be axially shifted.

From the foregoing it will be obviousviewing the invention as applied to initreboxes-that the saw-guide 7 may readily be adjusted away from and towards. the deck by simply loosening the set-screw 12 in order to permit the arm or bar 8 to be moved accordingly. If it is found desirable to vary the angular disposition of this arm with reference to the arm 9, in other words, to alter the direction in which the arm 8 en tends, while the arm 9 is relatively station ary, this may readily be accomplisned by moving the screw 17, which will rock the assembly supported by the bracket with respect to the adjusting arm.

It is obvious that when the set-screw 12 is projected the end of the same will come to fear against the arm 8 to thus lock the parts. lVhen retracted for the purpose of adjusting, the arm 9 will be maintained in operae tive contact with the bracket at three points, to wit, the lips 16 and the set-screw 1i, and as has been previously described, the angularitv may readily be adjusted by means of the latter.

Thus, the objects or this invention have been accomplished, and since certain changes may be mane in the above construction, and di'tlerent embodin'ients of the invention could be made, without departing from the scope thereof, it is intended that all matter contained in the above description, or shown in the accompanying drawing, shall be interpreted as illustrative and not in a limiting sense.

It is also to be understood that the following claims are intended to cover allot the generic and specific features 01 the invention herein described and all statements of the scope of the invention which as a matter of language might be said to fall therebetween.

Having described my invention, what I claim as new and desire to secure by Letters Patent is 1. In a mitreboX, in combination, a sawguide, an arm extending from the same, an adjusting arm, a bracket slidably associated with said first-named arm and enclosing a portion of the second arm, a set-screw ex tending through a screw-threaded bore formed in the second arm and adapted to have its end bear against said first-named arm, and means to rotate the bracket and the first named arm about the second arm.

:2. In a mitrebox, in combination, a sawguide, an arm extending from the same, an adjusting arm, a bracket slidably associated with said first-named arm and enclosing a portion of the second arm, a set-screw extending through a screw-threaded bore tonned in the second arm and adapted to have its end bear against said first-named arm, means to rock the bracket and the first named arm upon the second arm, and a prin-g interposed between the outer face of said bracket and said set-screw to oppose said rocking means.

3. In a mitreboz-z, in combination, a saw guide, an arm extending from the same, an adjusting arm, a bracket slidably associated with said first-named arm and enclosing a portion of the second arm, a set-screw e):- tending through a screw-threaded bore formed in the second arm and adapted to have its end bear against said first-named arm, and means for varying the angular disposition of one of said arms with reference to the other of the same.

4-. In a mitrebox, in combination, a sawguide, an arm extending from the same, an adjusting arm, a bracket slidably associated with said first-named arm and enclosing aportion of the second arm, a set-screw extending through a screw-threaded bore formed in the second arm and adapted to have its end bear against said first-uamed arm, and a further set-screw carried by said bracket and acting against said second arm whereby said bracket and the arm carried thereby may be rocked with respect to said second arm.

5. In combination, a pair of arms, a bracket formed with openings slidably accommodating one of said arms, the second oi said arms extending within said bracket, a. set-screw extending through a screwthreaded opening in the second arm and being adapted to have its end bear against said first arm, and means for rocking said bracket with respect to one of said arms.

6. In combination, a pair of arms, a bracket formed with openings slidably accommodating one of said arms, the second of said arms extending within said bracket, a set-screw extending through a screwthreaded opening in the second arm and being adapted to have its end bear against said first arm, and a set-screw carried by said bracket and bearing against said second arm whereby said bracket and the arm carried thereby may be rocked relatively to said first-named arm.

7 In combination, a pair of arms, a bracket formed with openings slidably accommodating one of said arms, the second of said arms extending Within said bracket, a set-screw extending through a screwthreadedopening in the second arm and being adapted to have its end bear a ainst said first arm, a lip forming a part of said second arm and adapted to bear against said bracket and to act as a fulcrum, and means bearing against said second arm for rocking the same relatively to said bracket.

8. In combination, a pair of arms, a bracket formed with openings slidably accommodating one of said arms, the second of said arms extending within said bracket, a set-screw extending through a screwthreaded opening in the second arm and being adapted to have its end bear against said first arm, means forming a part of said second arm and providing a fulcrum therefor in contact with said bracket, means for rocking said bracket relatively to said second arm, and a spring interposed between the head of said screw and said bracket.

9. In combination, a pair of arms, a

bracket formed with openings slidably accommodating one of said arms, the second of said arms extending Within said bracket, a set-screw extending through a screwthreaded opening in the second arm and being adapted to have its end bear against said first arm, means forming a part of said second arm and providing a fulcrum therefor in contact with said bracket, means for rocking said bracket relatively to said second arm, said second arm being formed with an angularly-disposed surface at a point relatively remote from said fulcrum, said bracket having a portion extending substantially parallel to the beveled portion of said arm, and a set-screw extending through a screwthreaded opening in said latter portion of the bracket and bearing against said second arm.

10. In combination, a pair of bars, movable means for adjustably connecting said bars, and means for relatively shifting said means and one of the bars connected therewith around the axis of the other bar, the

latter bar having a portion serving as a fulcrum for such movement.

In testimony whereof I aflix my signa ture.

DONALD B. SWAIN. 

